All excavating, filling and grading requirements and compacting work of the subbase should be performed so that the finished subgrade is 4″-6″ above the surrounding ground and slopes not less than 0.83% (1:120) and not more than 1% (1:100). Each court must slope on a true plane, preferably from side to side (but from end to end or from corner to corner are also acceptable), or in the shortest direction for good drainage and water runoff. The court should never be sloped from the net line to the baseline, from the baseline to the netline, from the sides to the centerline or from the centerline to the sides.

A leveling course of a hot plant mix having a maximum aggregate size of 3/8” to 3/4” in accordance with specifications of the state’s Department of Transportation and/or the Asphalt Institute should be constructed over the base course to a compacted thickness of not less than 1 1/2”.

This hot plant mix should be spread and compacted by methods and in a manner that produces a uniform density and thickness. The finished intermediate course should not vary more than 1/4” in 10’, when measured in any direction.

A modified base course is sometimes used, particularly in areas not subject to freeze/thaw action. The modified base may consist of one course of suitable material as described above and may be installed to a uniform thickness of 2 1/2″ to 4″. The modified base should be compacted to provide a smooth, true plane surface, and should not vary more than 1/4″ in 10′, when measured in any direction.

Thickness: Not less than 1”.

Liquid Asphalt Bitumen: Minimum 5.5% by weight.

Aggregate Type: Crushed stone, gravel, shale, limestone, etc. Foreign materials, i.e., pyrite, clay, ferrous compounds, dirt and organic material are not acceptable.

Cure Time: Minimum 14 days before application of playing surface.

Voids Content: Minimum as specified by the Department of Transportation or State Highways Department, but in no case should void content exceed 7%.